javafx - Changing the title image of a TitledPane -


using listener intend change background image of titledpane though have not achieved it. when start code, stylesheet shows 'downarrow' when expand/collapse titledpane, image disappears , nothing displayed. images use in same folder code , style sheet. code using following:

        titledpane.expandedproperty().addlistener((obs, wasexpanded, nowexpanded) -> {             if (nowexpanded) {                         titledpane.lookup(".title").setstyle(                      "-fx-background-image : url('downarrow.png'); "                  );             } else {                 titledpane.lookup(".title").setstyle(                     "-fx-background-image : url('leftarrow.png'); "                  );                             }         });

css file:

.titled-pane > .title {     -fx-background-image : url('downarrow.png');      -fx-background-repeat: stretch;        -fx-background-position: right; }


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